Pencil sharpener



FIG. 1 is a top perspective view of a pencil sharpener of the present invetion;

FIG. 2 is a front view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing portions of the bottom are included for information purposes only and form no part of the claimed design. 

The ornamental design for a pencil sharpener, as shown and described. 